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Q: Helium Balloons ( Answered,   1 Comment )
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 Subject: Helium Balloons Category: Science > Instruments and Methods Asked by: jockerboy-ga List Price: \$5.00 Posted: 24 Nov 2006 07:53 PST Expires: 24 Dec 2006 07:53 PST Question ID: 785242
 `How many 9 inch balloons are needed to lift a 600g piece of wood?` Clarification of Question by jockerboy-ga on 24 Nov 2006 07:53 PST `HELIUM GAS BALLOONS`
 ```Hello jockerboy, your answer is a simple application of the Archimedes bouyancy principle. Here are a couple of good sources: http://www.chem.hawaii.edu/uham/lift.html http://www.grc.nasa.gov/WWW/K-12/WindTunnel/Activities/ArchAnswer5.html Using numbers from the first source you can expect 1.03 grams of lift per liter of helium. Each of your 9 inch balloons has a volume of 6.255 liters. You should then get 6.44265 grams of lift from each balloon. Therefore, it would take 94 balloons to lift 600 grams. This is only an approximate number because these calculations were done at STP (20 degrees C and 760 mm Mercury) and the weight of the balloons themselves was neglected. If you can come up with an accurate weight of your theoretical balloons, we could get a more exact answer. I think that this should answer your question, but if there is something I have neglected please ask for a clarification. Redhoss```
 ```Nine-inch latex balloons weigh about a gram. Add a gram or two for any attaching device(s) and you'll be pretty close to losing half your lift.```